Mercurial > hg-old > index.cgi
annotate lwasm/insn_indexed.c @ 212:bae1e3ecdce1
More preparation for gnulib integration
| author | lost |
|---|---|
| date | Fri, 24 Apr 2009 06:43:02 +0000 |
| parents | 427e268e876b |
| children | 0df2a39a268c |
| rev | line source |
|---|---|
| 32 | 1 /* |
| 2 insn_indexed.c | |
|
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3 Copyright © 2009 William Astle |
| 32 | 4 |
| 5 This file is part of LWASM. | |
| 6 | |
| 7 LWASM is free software: you can redistribute it and/or modify it under the | |
| 8 terms of the GNU General Public License as published by the Free Software | |
| 9 Foundation, either version 3 of the License, or (at your option) any later | |
| 10 version. | |
| 11 | |
| 12 This program is distributed in the hope that it will be useful, but WITHOUT | |
| 13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
| 15 more details. | |
| 16 | |
| 17 You should have received a copy of the GNU General Public License along with | |
| 18 this program. If not, see <http://www.gnu.org/licenses/>. | |
| 19 */ | |
| 20 | |
| 21 /* | |
| 22 for handling indexed mode instructions | |
| 23 */ | |
| 24 | |
| 25 #define __insn_indexed_c_seen__ | |
| 26 | |
| 212 | 27 #include <config.h> |
| 28 | |
| 32 | 29 #include <ctype.h> |
| 30 #include <string.h> | |
| 31 | |
| 32 #include "lwasm.h" | |
| 33 #include "instab.h" | |
| 34 #include "expr.h" | |
| 35 | |
| 36 void insn_indexed_aux(asmstate_t *as, lwasm_line_t *l, const char **p, int *b1, int *b2, int *b3) | |
| 37 { | |
| 38 static const char *regs = "X Y U S W PCRPC "; | |
| 39 static const struct { char *opstr; int pb; } simpleindex[] = | |
| 40 { | |
| 41 {",x", 0x84}, {",y", 0xa4}, {",u", 0xc4}, {",s", 0xe4}, | |
| 42 {",x+", 0x80}, {",y+", 0xa0}, {",u+", 0xc0}, {",s+", 0xe0}, | |
| 43 {",x++", 0x81}, {",y++", 0xa1}, {",u++", 0xc1}, {",s++", 0xe1}, | |
| 44 {",-x", 0x82}, {",-y", 0xa2}, {",-u", 0xc2}, {",-s", 0xe2}, | |
| 45 {",--x", 0x83}, {",--y", 0xa3}, {",--u", 0xc3}, {",--s", 0xe3}, | |
| 46 {"a,x", 0x86}, {"a,y", 0xa6}, {"a,u", 0xc6}, {"a,s", 0xe6}, | |
| 47 {"b,x", 0x85}, {"b,y", 0xa5}, {"b,u", 0xc5}, {"b,s", 0xe5}, | |
| 48 {"e,x", 0x87}, {"e,y", 0xa7}, {"e,u", 0xc7}, {"e,s", 0xe7}, | |
| 49 {"f,x", 0x8a}, {"f,y", 0xaa}, {"f,u", 0xca}, {"f,s", 0xea}, | |
| 50 {"d,x", 0x8b}, {"d,y", 0xab}, {"d,u", 0xcb}, {"d,s", 0xed}, | |
| 51 {"w,x", 0x8e}, {"w,y", 0xae}, {"w,u", 0xce}, {"w,s", 0xee}, | |
| 52 {",w", 0x8f}, {",w++", 0xcf}, {",--w", 0xef}, | |
| 53 | |
| 54 {"[,x]", 0x94}, {"[,y]", 0xb4}, {"[,u", 0xd4}, {"[,s]", 0xf4}, | |
| 55 {"[,x++]", 0x91}, {"[,y++]", 0xb1}, {"[,u++]", 0xd1}, {"[,s++]", 0xf1}, | |
| 56 {"[,--x]", 0x93}, {"[,--y]", 0xb3}, {"[,--u]", 0xd3}, {"[,--s]", 0xf3}, | |
| 57 {"[a,x]", 0x96}, {"[a,y]", 0xb6}, {"[a,u]", 0xd6}, {"[a,s]", 0xf6}, | |
| 58 {"[b,x]", 0x95}, {"[b,y]", 0xb5}, {"[b,u]", 0xd5}, {"[b,s]", 0xf5}, | |
| 59 {"[e,x]", 0x97}, {"[e,y]", 0xb7}, {"[e,u]", 0xd7}, {"[e,s]", 0xf7}, | |
| 60 {"[f,x]", 0x9a}, {"[f,y]", 0xba}, {"[f,u]", 0xda}, {"[f,s]", 0xfa}, | |
| 61 {"[d,x]", 0x9b}, {"[d,y]", 0xbb}, {"[d,u]", 0xdb}, {"[d,s]", 0xfd}, | |
| 62 {"[w,x]", 0x9e}, {"[w,y]", 0xbe}, {"[w,u]", 0xde}, {"[w,s]", 0xfe}, | |
| 63 {"[,w]", 0x90}, {"[,w++]", 0xd0}, {"[,--w]", 0xf0}, | |
| 64 | |
| 65 { "", -1 } | |
| 66 }; | |
| 67 char stbuf[25]; | |
| 81 | 68 int i, j, rn; |
| 69 int f8 = 0, f16 = 0, f0 = 0; | |
| 70 int r, v; | |
| 32 | 71 int indir = 0; |
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72 int fs8 = 0, fs16 = 0; |
| 81 | 73 |
| 74 // initialize output bytes | |
| 32 | 75 *b1 = *b2 = *b3 = -1; |
| 76 | |
| 81 | 77 // fetch out operand for lookup |
| 32 | 78 for (i = 0; i < 24; i++) |
| 79 { | |
| 80 if (*((*p) + i) && !isspace(*((*p) + i))) | |
| 81 stbuf[i] = *((*p) + i); | |
| 82 else | |
| 83 break; | |
| 84 } | |
| 85 stbuf[i] = '\0'; | |
| 81 | 86 |
| 87 // now look up operand in "simple" table | |
| 32 | 88 if (!*((*p) + i) || isspace(*((*p) + i))) |
| 89 { | |
| 90 // do simple lookup | |
| 91 for (j = 0; simpleindex[j].opstr[0]; j++) | |
| 92 { | |
| 93 if (!strcasecmp(stbuf, simpleindex[j].opstr)) | |
| 94 break; | |
| 95 } | |
| 96 if (simpleindex[j].opstr[0]) | |
| 97 { | |
| 98 *b1 = simpleindex[j].pb; | |
| 99 (*p) += i; | |
| 100 return; | |
| 101 } | |
| 102 } | |
| 81 | 103 |
| 104 // now do the "hard" ones | |
| 105 | |
| 106 // is it indirect? | |
| 32 | 107 if (**p == '[') |
| 108 { | |
| 109 indir = 1; | |
| 110 (*p)++; | |
| 111 } | |
| 112 | |
| 81 | 113 // look for a "," - all indexed modes have a "," except extended indir |
| 32 | 114 rn = 0; |
| 115 for (i = 0; (*p)[i] && !isspace((*p)[i]); i++) | |
| 116 { | |
| 117 if ((*p)[i] == ',') | |
| 118 { | |
| 119 rn = 1; | |
| 120 break; | |
| 121 } | |
| 122 } | |
| 81 | 123 |
| 124 // if no "," and indirect, do extended indir | |
| 32 | 125 if (!rn && indir) |
| 126 { | |
| 127 // extended indir | |
| 128 *b1 = 0x9f; | |
| 129 *b2 = 0; | |
| 130 *b3 = 0; | |
| 81 | 131 r = lwasm_expr_result2(as, l, (char **)p, 0, &v, 0); |
| 132 if (r < 0) | |
| 32 | 133 { |
| 134 return; | |
| 135 } | |
| 136 if (**p != ']') | |
| 137 { | |
| 138 register_error(as, l, 1, "Bad operand"); | |
| 139 return; | |
| 140 } | |
| 81 | 141 |
| 32 | 142 (*p)++; |
| 81 | 143 |
| 144 if (r == 1 && as -> passnum == 2) | |
| 32 | 145 { |
| 81 | 146 l -> relocoff = as -> addr - l -> codeaddr + 1; |
| 32 | 147 } |
| 81 | 148 |
| 149 *b2 = (v >> 8) & 0xff; | |
| 150 *b3 = v & 0xff; | |
| 32 | 151 return; |
| 152 } | |
| 153 | |
| 81 | 154 // if we've previously forced the offset size, make a note of it |
| 155 if (l -> fsize == 1) | |
| 156 f8 = 1; | |
| 157 else if (l -> fsize == 2) | |
| 158 f16 = 1; | |
| 159 | |
| 32 | 160 if (**p == '<') |
| 161 { | |
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162 fs8 = 1; |
| 32 | 163 (*p)++; |
| 164 } | |
| 165 else if (**p == '>') | |
| 166 { | |
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167 fs16 = 1; |
| 32 | 168 (*p)++; |
| 169 } | |
| 170 | |
| 171 if (**p == '0' && *(*p+1) == ',') | |
| 172 { | |
| 173 f0 = 1; | |
| 174 } | |
| 175 | |
| 176 // now we have to evaluate the expression | |
| 81 | 177 r = lwasm_expr_result2(as, l, (char **)p, 0, &v, 0); |
| 178 if (r < 0) | |
| 32 | 179 { |
| 180 return; | |
| 181 } | |
| 182 // now look for a comma; if not present, explode | |
| 183 if (*(*p)++ != ',') | |
| 184 { | |
| 185 // syntax error; force 0 bit | |
| 186 *b1 = 00; | |
| 81 | 187 l -> fsize = 0; |
| 32 | 188 return; |
| 189 } | |
| 190 | |
| 191 // now get the register | |
| 192 rn = lwasm_lookupreg3(regs, p); | |
| 193 if (rn < 0) | |
| 81 | 194 { |
| 195 *b1 = 0; | |
| 196 l -> fsize = 0; | |
| 197 register_error(as, l, 1, "Bad register"); | |
| 198 return; | |
| 199 } | |
| 200 | |
| 32 | 201 if (indir) |
| 202 { | |
| 203 if (**p != ']') | |
| 81 | 204 { |
| 205 register_error(as, l, 1, "Bad operand"); | |
| 206 l -> fsize = 0; | |
| 207 *b1 = 0; | |
| 208 return; | |
| 209 } | |
| 32 | 210 else |
| 211 (*p)++; | |
| 212 } | |
| 213 | |
| 81 | 214 // incomplete reference on pass 1 forces 16 bit |
| 215 if (r == 1 && as -> passnum == 1) | |
| 216 { | |
| 217 f16 = 1; | |
| 218 l -> fsize = 2; | |
| 219 } | |
| 220 | |
| 221 // incomplete reference on pass 2 needs relocoff set | |
| 222 if (r == 1 && as -> passnum == 2) | |
| 223 { | |
| 224 l -> relocoff = as -> addr - l -> codeaddr + 1; | |
| 225 } | |
| 226 | |
| 227 // nnnn,W is only 16 bit (or 0 bit) | |
| 32 | 228 if (rn == 4) |
| 229 { | |
| 230 if (f8) | |
| 81 | 231 { |
| 232 register_error(as, l, 1, "n,W cannot be 8 bit"); | |
| 233 l -> fsize = 0; | |
| 234 *b1 = 0; | |
| 235 return; | |
| 236 } | |
| 237 // note: set f16 above for incomplete references | |
| 238 // also set reloc offset | |
| 239 if (!f16 && !f0 && !(as -> pragmas & PRAGMA_NOINDEX0TONONE) && v == 0) | |
| 32 | 240 { |
| 241 if (indir) | |
| 242 *b1 = 0x90; | |
| 243 else | |
| 244 *b1 = 0x8f; | |
| 245 return; | |
| 246 } | |
| 81 | 247 |
| 32 | 248 if (indir) |
| 249 *b1 = 0xb0; | |
| 250 else | |
| 251 *b1 = 0xcf; | |
| 81 | 252 *b2 = (v >> 8) & 0xff; |
| 253 *b3 = v & 0xff; | |
| 32 | 254 return; |
| 255 } | |
| 256 | |
| 81 | 257 // set indir to correct bit value |
| 32 | 258 if (indir) indir = 0x10; |
| 259 | |
| 81 | 260 // PCR? then we have PC relative addressing (like B??, LB??) |
| 32 | 261 if (rn == 5) |
| 262 { | |
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263 lwasm_expr_term_t *t; |
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264 // external references are handled exactly the same as for |
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265 // relative addressing modes |
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266 // on pass 1, adjust the expression for a subtraction of the |
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267 // current address |
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268 |
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269 // need to re-evaluate the expression with "SECTCONST"... |
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270 r = lwasm_expr_result2(as, l, (char **)p, EXPR_SECTCONST | EXPR_REEVAL, &v, 0); |
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271 if (r != 0) |
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272 v = 0; |
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273 if (as -> passnum == 1) |
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274 { |
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275 l -> fsize = 0; |
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276 } |
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277 f8 = f16 = 0; |
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278 if (r == 1 && as -> passnum == 1 && !fs8) |
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279 { |
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280 l -> fsize = 2; |
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281 f16 = 1; |
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282 } |
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283 if (fs8) |
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284 f8 = 1; |
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285 if (fs16) |
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286 f16 = 1; |
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287 if (l -> fsize == 2) |
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288 f16 = 1; |
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289 else if (l -> fsize == 1) |
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290 f8 = 1; |
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291 if (as -> passnum == 1) |
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292 v -= as -> addr; |
| 32 | 293 |
| 294 // we have a slight problem here | |
| 295 // PCR based on current insn loc is really | |
| 296 // -125 <= offset <= +130 (8 bit offset) | |
| 297 // NOTE: when we are called, we already have the opcode emitted | |
| 298 // so we only need to worry about the size of the operand | |
| 299 // hence the 2 and 3 magic numbers below instead of 3 and 4 | |
| 300 // (and that also avoids errors with two byte opcodes, etc) | |
| 81 | 301 if (f8 || (!f16 && v >= -125 && v <= 130)) |
| 32 | 302 { |
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303 f8 = 1; |
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304 l -> fsize = 1; |
| 32 | 305 *b1 = indir | 0x8C; |
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306 if (as -> passnum == 1) |
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307 v -= 2; |
| 81 | 308 if (v < -128 || v > 127) |
| 32 | 309 register_error(as, l, 2, "Byte overflow"); |
| 81 | 310 *b2 = v & 0xff; |
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311 if (r != 0 && as -> passnum == 2) |
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312 { |
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313 register_error(as, l, 2, "Illegal incomplete reference"); |
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314 } |
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315 goto finpcr; |
| 32 | 316 } |
| 317 | |
| 318 // anything else is 16 bit offset | |
| 319 // need 16 bit | |
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320 |
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321 l -> fsize = 2; |
| 32 | 322 *b1 = indir | 0x8D; |
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323 if (as -> passnum == 1) |
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324 v -= 3; |
| 81 | 325 *b2 = (v >> 8) & 0xff; |
| 326 *b3 = v & 0xff; | |
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327 if (as -> passnum == 2 && r == 1) |
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328 { |
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329 t = lwasm_expr_term_create_secbase(); |
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330 lwasm_expr_stack_push(l -> exprs[0], t); |
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331 lwasm_expr_term_free(t); |
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332 t = lwasm_expr_term_create_oper(LWASM_OPER_MINUS); |
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333 lwasm_expr_stack_push(l -> exprs[0], t); |
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334 lwasm_expr_term_free(t); |
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335 } |
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336 |
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337 finpcr: |
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338 if (as -> passnum == 1) |
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339 { |
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340 // need to adjust the expression |
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341 if (l -> exprs[0]) |
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342 { |
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343 t = lwasm_expr_term_create_int(as -> addr + (f8 ? 2 : 3)); |
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344 lwasm_expr_stack_push(l -> exprs[0], t); |
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345 lwasm_expr_term_free(t); |
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346 t = lwasm_expr_term_create_oper(LWASM_OPER_MINUS); |
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347 lwasm_expr_stack_push(l -> exprs[0], t); |
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348 lwasm_expr_term_free(t); |
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349 } |
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350 else |
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351 { |
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352 l -> exprvals[0] -= as -> addr + (f8 ? 2 : 3); |
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353 } |
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354 } |
| 32 | 355 return; |
| 356 } | |
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357 if (fs16) |
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358 f16 = 1; |
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359 if (fs8) |
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360 f8 = 1; |
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361 |
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362 if (f8 && r != 0) |
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363 { |
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364 register_error(as, l, 2, "Illegal external or inter-section reference"); |
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365 r = 0; |
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366 v = 0; |
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367 } |
| 32 | 368 |
| 81 | 369 // constant offset from PC (using PC as regular register :) ) |
| 370 // FIXME: handle external references intelligently | |
| 32 | 371 if (rn == 6) |
| 372 { | |
| 81 | 373 if (f8 || (!f16 && v >= -128 && v <= 127)) |
| 32 | 374 { |
| 375 *b1 = indir | 0x8C; | |
| 81 | 376 if (v < -128 || v > 127) |
| 32 | 377 register_error(as, l, 2, "Byte overflow"); |
| 81 | 378 *b2 = v & 0xff; |
| 32 | 379 return; |
| 380 } | |
| 381 | |
| 382 // everything else must be 16 bit | |
| 383 // need 16 bit | |
| 384 *b1 = indir | 0x8D; | |
| 81 | 385 *b2 = (v >> 8) & 0xff; |
| 386 *b3 = v & 0xff; | |
| 32 | 387 return; |
| 388 } | |
| 389 | |
| 390 // we only have to deal with x,y,u,s here | |
| 81 | 391 if (!f8 && !f16 && v >= -16 && v <= 15) |
| 32 | 392 { |
| 81 | 393 // zero offset going to ,R? |
| 394 if (v == 0 && !f0 && !(as -> pragmas & PRAGMA_NOINDEX0TONONE)) | |
| 32 | 395 { |
| 396 *b1 = rn << 5 | indir | 0x80 | 0x04; | |
| 397 return; | |
| 398 } | |
| 81 | 399 |
| 400 // no 5 bit on indirect | |
| 32 | 401 if (indir) |
| 402 { | |
| 403 f8 = 1; | |
| 81 | 404 l -> fsize = 1; |
| 32 | 405 goto no5bit; |
| 406 } | |
| 81 | 407 |
| 408 // 5 bit addressing | |
| 409 *b1 = rn << 5 | (v & 0x1F); | |
| 32 | 410 return; |
| 411 } | |
| 81 | 412 |
| 32 | 413 no5bit: |
| 81 | 414 if (f16 || (!f8 && (v < -128 || v > 127))) |
| 32 | 415 { |
| 416 // must be a 16 bit offset here | |
| 417 *b1 = rn << 5 | indir | 0x80 | 0x09; | |
| 81 | 418 *b2 = (v >> 8) & 0xff; |
| 419 *b3 = v & 0xff; | |
| 32 | 420 return; |
| 421 } | |
| 422 | |
| 423 // if we're here, we have an 8 bit offset | |
| 81 | 424 // note: cannot get here if incomplete reference detected above |
| 32 | 425 *b1 = rn << 5 | indir | 0x80 | 0x08; |
| 81 | 426 if (v < -128 || v > 127) |
| 32 | 427 register_error(as, l, 2, "Byte overflow"); |
| 81 | 428 *b2 = v & 0xff; |
| 32 | 429 return; |
| 430 } | |
| 431 | |
| 432 OPFUNC(insn_indexed) | |
| 433 { | |
| 434 int b1, b2, b3; | |
| 435 | |
| 436 lwasm_emitop(as, l, instab[opnum].ops[0]); | |
| 437 | |
| 438 insn_indexed_aux(as, l, (const char **)p, &b1, &b2, &b3); | |
| 439 if (b1 != -1) | |
| 440 lwasm_emit(as, l, b1); | |
| 441 if (b2 != -1) | |
| 442 lwasm_emit(as, l, b2); | |
| 443 if (b3 != -1) | |
| 444 lwasm_emit(as, l, b3); | |
| 445 } |